On Fri, 2006-12-15 at 21:31 -0500, ext Mike Lococo wrote: > Hi Folks, > > >> I'm finding that large (>200MB) transfers of data via the wifi network > >> are extremely unreliable. > > > > Are you sure network is a problem? Are you writing data somewhere? Both > > MMC card and iternal flash are really slow when writing. > > This is the issue. I can reproduce both the slow write speed (~150KB/s) > and the GUI unresponsiveness with (from memory, please forgive any typos): > > dd if=/dev/zero of=/media/mmc1/test.file bs=1M count=250
I asked around and there seems to be a known kernel problem with this, but there's a workaround: it should work if you use 4k block size. BR, Kimmo > > which doesn't involve the network at all. > > I may do some playing with multiblock write kernels at this point, > although it's not so much the (average) speed that's the problem. I > think the real issue is that the CPU doesn't seem to be able to service > requests from other subsystems in a timely manner once the write cache > fills up. Userspace programs are getting regularly starved for CPU time > for several seconds at a time, which causes the wildly fluctuating > transfer rates, the unresponsive GUI, the Unison sessions dropping, and > possibly the reboots (as programs aren't responding to the watchdog > promptly?). > > The Unison failures, in particular, are disappointing. It is such an > awesome program for syncing the 770 to a desktop system, but if you have > a large MMC (and you change its contents regularly) it isn't usable at all. > > Thanks, > Mike > _______________________________________________ > maemo-developers mailing list > maemo-developers@maemo.org > https://maemo.org/mailman/listinfo/maemo-developers _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://maemo.org/mailman/listinfo/maemo-developers
